musalla vs synagogue

musalla

noun
  • A place for praying (e.g. outside a mosque); a praying room. 

synagogue

noun
  • A place of worship for Jews or Samaritans. 

  • A congregation of Jews or Samaritans for the purpose of worship or religious study. 

How often have the words musalla and synagogue occurred in a corpus of books? (source: Google Ngram Viewer )